A combination photo shows pro-democracy protesters gathering at the Occupy Central protest site in a December 10, 2014 file photo (top) and traffic resuming after the main "Occupy" protest site was cleared on December 12, 2014, at Admiralty in Hong Kong. As the dust settles on Hong Kong's pro-democracy 'Occupy' protests, China is likely to embark on a sweeping but covert campaign across the territory's judiciary, media and universities to ensure there is no recurrence, activists and politicians say. REUTERS/Athit Perawongmetha (CHINA - Tags: POLITICS CIVIL UNREST TPX IMAGES OF THE DAY)

A combination photo shows pro-democracy protesters gathering at the Occupy Central protest site in a December 10, 2014 file photo (top) and traffic resuming after the main "Occupy" protest site was cleared on December 12, 2014, at Admiralty in Hong Kong. As the dust settles on Hong Kong's pro-democracy 'Occupy' protests, China is likely to embark on a sweeping but covert campaign across the territory's judiciary, media and universities to ensure there is no recurrence, activists and politicians say. REUTERS/Athit Perawongmetha (CHINA - Tags: POLITICS CIVIL UNREST TPX IMAGES OF THE DAY)